Polymer film and polymer film device using same

ABSTRACT

The present invention relates to a polymer film comprising a polymer having liquid crystallinity, having a number-average molecular weight in terms of polystyrene of 10 3  to 10 8  and having an electron mobility or hole mobility of 10 −5  cm 2 /Vs or more, and having a film thickness in the range from 1 nm to 100 μm. This polymer film can be used for various polymer film devices such as an organic transistor, organic solar battery, optical sensor, electrophotographic photoreceptor, spatial light modulator, photorefractive device and the like.

FIELD OF THE INVENTION

The present invention relates to a polymer film and a polymer filmdevice using the polymer film.

BACKGROUND TECHNOLOGY

Films containing an organic material having an electron transportingproperty and a hole transporting property provide an expectation ofapplication to a film device such as an organic solar battery and thelike, and variously investigated.

As such films, films are studied composed of a polymer compound havingin its main chain a molecule structure having an electron transportingproperty or a hole transporting property, and examples thereof includepolymer films made of polyphenylene vinylene derivatives, polyfluorenederivatives, polyphenylene derivatives, polythiophene derivatives andthe like.

DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a novel polymer filmuseful as a film for a film device such as an organic transistor,organic solar battery and the like.

The present inventors have intensively studied for attaining theabove-mentioned object, and resultantly found a polymer film useful as afilm for a film device, completing the present invention. Namely, thepresent invention relates to a polymer film comprising a polymer havingliquid crystallinity, having a number-average molecular weight in termsof polystyrene of 10³ to 10⁸ and having an electron mobility or holemobility of 10⁻⁵ cm²/Vs or more, and having a film thickness in therange from 1 nm to 100 μm.

BRIEF EXPLANATION OF DRAWINGS

FIG. 1 shows a schematic sectional view of a reverse stagger typeorganic transistor according to the present invention.

FIG. 2 shows a schematic sectional view of a forward stagger typeorganic transistor according to the present invention.

FIG. 3 shows a schematic sectional view of a solar battery according tothe present invention.

FIG. 4 shows a schematic sectional view of a layered type optical sensoraccording to the present invention.

FIG. 5 shows a schematic sectional view of a layered type optical sensoraccording to the present invention.

FIG. 6 shows a schematic sectional view of a single-layer type opticalsensor according to the present invention.

FIG. 7 shows a schematic sectional view of a single-layer typeelectrophotographic photoreceptor according to the present invention.

FIG. 8 shows a schematic sectional view of a layered typeelectrophotographic photoreceptor according to the present invention.

FIG. 9 shows a schematic sectional view of a layered typeelectrophotographic photoreceptor according to the present invention.

FIG. 10 shows a schematic sectional view of a spatial light modulatoraccording to the present invention.

FIG. 11 shows a schematic sectional view of a photorefractive deviceaccording to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The polymer used in a polymer film of the present invention is requiredto have liquid crystallinity. Here, to have liquid crystallinity meansthat a polymer shows a liquid crystal phase, and those having liquidcrystallinity at a temperature of 100° C. or more are preferable.Showing liquid crystallinity can be confirmed by observation with apolarized microscope, differential scanning calorimetry, X-raydiffraction measurement and the like.

The number-average molecular weight in terms of polystyrene of a polymerused in a polymer film of the present invention is from 10³ to 10⁸,preferably from 10⁴ to 10⁶.

This polymer has an electron mobility or hole mobility of 10⁻⁵ cm²/Vs ormore, further preferably 10⁻⁴ cm²/Vs or more. The electron mobility andthe hole mobility can be measured by a time of flight method, electricfield effect transistor method and the like.

Of polymers used in the present invention, polymers having in its mainchain a 5-membered ring structure containing a hetero atom arepreferable, and more preferable are those containing a repeating unit ofthe following formula (1-1), (1-2), (1-3), (1-4) or (1-5) (hereinafter,referred to as hetero atom-condensed ring unit, in some cases).

In the formulae, X represents a hetero atom or a divalent groupcontaining hetero atoms.

In the divalent group containing hetero atoms, one hetero atom containedin the group is required to be contained in a 5-membered ring adjacentto A to G rings of the repeating units.

Here, the hetero atom means an atom other than carbon havingsufficiently stable covalent valency of at least two, and includesoxygen, sulfur, nitrogen, phosphorus, boron and the like.

As X, preferable are S, O as a hetero atom and SiRR′ as a divalent groupcontaining hetero atoms, and more preferable is S.

R and R′ in SiRR′ each independently represent a hydrogen atom, halogenatom, hydroxyl group, alkyl group, alkoxy group, alkylthio group, arylgroup, aryloxy group, arylthio group, arylalkyl group, arylalkoxy group,arylalkylthio group, substituted amino group, or monovalent heterocyclicgroup.

A ring, B ring, C ring, D ring, E ring, F ring and G ring eachindependently represent an aromatic ring. As the aromatic ring,exemplified are: aromatic hydrocarbon ring, such as benzene ring,naphthalene ring, anthracene ring, tetracene ring, pentacene ring,pyrene ring, phenanthrene ring, etc.; and hetero atom aromatic ring,such as pyridine ring, bipyridine ring, phenanthroline ring, quinolinering, isoquinoline ring, thiophen ring, furan ring, pyrrole ring, etc.

The aromatic ring may have a substituent selected from a groupconsisting of alkyl group, alkoxy group, alkylthio group, aryl group,aryloxy group, arylthio group, arylalkyl group, arylalkoxy group,arylalkylthio group, arylalkenyl group, arylalkynyl group, amino group,substituted amino group, silyl group, substituted silyl group, halogenatom, acyl group, acyloxy group, imino group, amide group, imide group,monovalent heterocyclic group, carboxyl group, substituted carboxylgroup, and cyano group. When a plurality of the sabstituents exist, theymay be the same or different.

The alkyl group in the above substituent may be any of linear, branched,or cyclic, and usually has about 1 to 20 carbon atoms. Examples thereofinclude methyl group, ethyl group, propyl group, i-propyl group, butylgroup, i-butyl group, t-butyl group, pentyl group, hexyl group,cyclohexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonylgroup, decyl group, 3,7-dimethyloctyl group, lauryl group,trifluoromethyl group, pentafluoroethyl group, perfluorobutyl group,perfluorohexyl group, perfluorooctyl group, etc., and pentyl group,hexyl group, octyl group, 2-ethylhexyl group, decyl group, and3,7-dimethyloctyl group are preferable.

The alkoxy group may be any of linear, branched, or cyclic, and usuallyhas about 1 to 20 carbon atoms. Examples thereof include methoxy group,ethoxy group, propyloxy group, i-propyloxy group, butoxy group, i-butoxygroup, t-butoxy group, pentyloxy group, hexyloxy group, cyclohexyloxygroup, heptyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxygroup, decyloxy group, 3,7-dimethyloctyloxy group, lauryloxy group,trifluoromethoxy group, pentafluoroethoxy group, perfluorobutoxy group,perfluorohexyl group, perfluorooctyl group, methoxymethyloxy group,2-methoxyethyloxy group, etc., and pentyloxy group, hexyloxy group,octyloxy group, 2-ethylhexyloxy group, decyloxy group,3,7-dimethyloctyloxy group are preferable.

The alkylthio group may be any of linear, branched, or cyclic, andusually has about 1 to 20 carbon atoms. Examples thereof includemethylthio group, ethylthio group, propylthio group, i-propylthio group,butylthio group, i-butylthio group, t-butylthio group, pentylthio group,hexylthio group, cyclohexylthio group, heptylthio group, octylthiogroup, 2-ethylhexylthio group, nonylthio group, decylthio group,3,7-dimethyloctylthio group, laurylthio group, trifluoromethylthiogroup, etc., and pentylthio group, hexylthio group, octylthio group,2-ethylhexylthio group, decylthio group, 3,7-dimethyloctylthio group arepreferable.

The aryl group usually has about 6 to 60 carbon atoms. Examples thereofinclude phenyl group, C₁-C₁₂ alkoxyphenyl group (C₁-C₁₂ means the numberof carbon atoms of 1 to 12. Hereinafter, means the same), C₁-C₁₂alkylphenyl group, 1-naphtyl group, 2-naphtyl group, 1-anthracenylgroup, 2-anthracenyl group, 9-anthracenyl group, pentafluorophenylgroup, and C₁-C₁₂ alkoxyphenyl group, and C₁-C₁₂ alkylphenyl group arepreferable. Here, the aryl group means a group in which one hydrogenatom is removed from an aromatic hydrocarbon. The aromatic hydrocarbonincludes those containing a condensed ring, and those containing two ormore independent benzene rings or condensed rings bonded directly orthrough a group such as a vinylene group or the like.

Specific examples of C₁-C₁₂ alkoxy include methoxy, ethoxy, propyloxy,i-propyloxy, butoxy, i-butoxy, t-butoxy, pentyloxy, hexyloxy,cyclohexyloxy, heptyloxy, octyloxy, 2-ethylhexyloxy, nonyloxy, decyloxy,3,7-dimethyloctyloxy, lauryloxy, etc.

Specific examples of C₁-C₁₂ alkylphenyl group include methylphenylgroup, ethylphenyl group, dimethylphenyl group, propylphenyl group,mesityl group, methylethylphenyl group, i-propylphenyl group,butylphenyl group, i-butylphenyl group, t-butylphenyl group,pentylphenyl group, isoamylphenyl group, hexylphenyl group, heptylphenylgroup, octylphenyl group, nonylphenyl group, decylphenyl group,dodecylphenyl group, etc.

The aryloxy group has usually about 6-60 carbon atoms, and specificexamples thereof include phenoxy group, C₁-C₁₂ alkoxyphenoxy group,C₁-C₁₂ alkylphenoxy group, 1-naphtyloxy group, 2-naphtyloxy group,pentafluorophenyloxy group, etc., and C₁-C₁₂ alkoxyphenoxy group, andC₁-C₁₂ alkylphenoxy group are preferable.

Specific examples of C₁-C₁₂ alkoxy include methoxy, ethoxy, propyloxy,i-propyloxy, butoxy, i-butoxy, t-butoxy, pentyloxy, hexyloxy,cyclohexyloxy, heptyloxy, octyloxy, 2-ethylhexyloxy, nonyloxy, decyloxy,3,7-dimethyloctyloxy, lauryloxy, etc. Specific examples of C₁-C₁₂alkylphenoxy group include methylphenoxy group, ethylphenoxy group,dimethylphenoxy group, propylphenoxy group, 1,3,5-trimethylphenoxygroup, methylethylphenoxy group, i-propylphenoxy group, butylphenoxygroup, i-butylphenoxy group, t-butylphenoxy group, pentylphenoxy group,isoamylphenoxy group, hexylphenoxy group, heptylphenoxy group,octylphenoxy group, nonylphenoxy group, decylphenoxy group,dodecylphenoxy group, etc.

The arylthio group has usually about 3-60 carbon atoms, and specificexamples thereof include phenylthio group, C₁-C₁₂ alkoxyphenylthiogroup, C₁-C₁₂ alkylphenylthio group, 1-naphthylthio group,2-naphthylthio group, pentafluorophenylthio group, etc., and C₁-C₁₂alkoxyphenylthio group, and C₁-C₁₂ alkylphenylthio group are preferable.

The arylalkyl group has usually about 7-60 carbon atoms, and specificexamples thereof include phenyl-C₁-C₁₂ alkyl group, C₁-C₁₂alkoxyphenyl-C₁-C₁₂ alkyl group, C₁-C₁₂ alkylphenyl-C₁-C₁₂ alkyl group,1-naphtyl-C₁-C₁₂ alkyl group, 2-naphtyl-C₁-C₁₂ alkyl group, etc., andC₁-C₁₂ alkoxyphenyl-C₁-C₁₂ alkyl group, and C₁-C₁₂ alkylphenyl-C₁-C₁₂alkyl group are preferable.

The arylalkoxy group has usually about 7-70 carbon atoms, and specificexamples thereof include: phenyl-C₁-C₁₂ alkoxy groups, suc asphenylmethoxy group, phenylethoxy group, phenylbutoxy group,phenylpentyloxy group, phenylhexyloxy group, phenylheptyloxy group,phenyloctyloxy group, etc.; C₁-C₁₂ alkoxyphenyl-C₁-C₁₂ alkoxy group,C₁-C₁₂ alkylphenyl-C₁-C₁₂ alkoxy group, 1-naphtyl-C₁-C₁₂ alkoxy group,2-naphtyl-C₁-C₁₂ alkoxy group, etc.; and C₁-C₁₂ alkoxyphenyl-C₁-C₁₂alkoxy group, and C₁-C₁₂ alkylphenyl-C₁-C₁₂ alkoxy group are preferable.

The arylalkylthio group has usually about 7-60 carbon atoms, andspecific examples thereof include phenyl-C₁-C₁₂ alkylthio group, C₁-C₁₂alkoxyphenyl-C₁-C₁₂ alkylthio group, C₁-C₁₂ alkylphenyl-C₁-C₁₂ alkylthiogroup, 1-naphtyl-C₁-C₁₂ alkylthio group, 2-naphtyl-C₁-C₁₂ alkylthiogroup, etc., and C₁-C₁₂ alkoxyphenyl-C₁-C₁₂ alkylthio group, and C₁-C₁₂alkylphenyl-C₁-C₁₂ alkylthio group are preferable.

The arylalkenyl group has usually about 7-60 carbon atoms, and specificexamples thereof include phenyl-C₂-C₁₂ alkenyl group, C₁-C₁₂alkoxyphenyl-C₂-C₁₂ alkenyl group, C₁-C₁₂ alkylphenyl-C₂-C₁₂ alkenylgroup, 1-naphtyl-C₂-C₁₂ alkenyl group, 2-naphtyl-C₂-C₁₂ alkenyl group,etc., and C₁-C₁₂ alkoxyphenyl-C₂-C₁₂ alkenyl group, and C₂-C₁₂alkylphenyl-C₁-C₁₂ alkenyl group are preferable.

The arylalkynyl group has usually about 7-60 carbon atoms, and specificexamples thereof include phenyl-C₂-C₁₂ alkynyl group, C₁-C₁₂alkoxyphenyl-C₂-C₁₂ alkynyl group, C₁-C₁₂ alkylphenyl-C₂-C₁₂ alkynylgroup, 1-naphtyl-C₂-C₁₂ alkynyl group, 2-naphtyl-C₂-C₁₂ alkynyl group,etc. and C₁-C₁₂ alkoxyphenyl-C₂-C₁₂ alkynyl group, and C₁-C₁₂alkylphenyl-C₂-C₁₂ alkynyl group are preferable.

The substituted amino group means an amino group which is substituted byone or two groups selected from alkyl group, aryl group, arylalkyl groupand monovalent heterocyclic group, and the substituent has usually 1 to60 carbon atoms.

Specific examples thereof include methylamino group, dimethylaminogroup, ethylamino group, diethylamino group, propylamino group,dipropylamino group, i-propylamino group, diisopropylamino group,butylamino group, i-butylamino group, t-butylamino group, pentylaminogroup, hexylamino group, cyclohexylamino group, heptylamino group,octylamino group, 2-ethylhexylamino group, nonylamino group, decylaminogroup, 3,7-dimethyloctylamino group, laurylamino group, cyclopentylaminogroup, dicyclopentylamino group, cyclohexylamino group,dicyclohexylamino group, pyrrolidyl group, piperidyl group,ditrifluoromethylamino groupphenylamino group, diphenylamino group,C₁-C₁₂ alkoxyphenylamino group, di(C₁-C₁₂ alkoxyphenyl)amino group,di(C₁-C₁₂ alkylphenyl)amino group, 1-naphtylamino group, 2-naphtylaminogroup, pentafluorophenylamino group, pyridylamino group,pyridazinylamino group, pyrimidylamino group, pyrazylamino group,triazylamino group phenyl-C₁-C₁₂ alkylamino group, C₁-C₁₂alkoxyphenyl-C₁-C₁₂ alkylamino group, C₁-C₁₂ alkylphenyl-C₁-C₁₂alkylamino group, di(C₁-C₁₂ alkoxyphenyl-C₁-C₁₂ alkyl)amino group,di(C₁-C₁₂ alkylphenyl-C₁-C₁₂ alkyl)amino group, 1-naphtyl-C₁-C₁₂alkylamino group, 2-naphtyl-C₁-C₁₂ alkylamino group, etc.

The substituted silyl group means a silyl group which is substituted byone, two or three groups selected from alkyl group, aryl group,arylalkyl group and monovalent heterocyclic group. The substituentusually has 1 to 60 carbon atoms.

Specific examples thereof include trimethylsilyl group, triethylsilylgroup, tripropylsilyl group, tri-i-propylsilyl group,dimethyl-i-propylsilyl group, diethyl-i-propylsilyl group,t-butylsilyldimethylsilyl group, pentyldimethylsilyl group,hexyldimethylsilyl group, heptyldimethylsilyl group, octyldimethylsilylgroup, 2-ethylhexyl-dimethylsilyl group, nonyldimethylsilyl group,decyldimethylsilyl group, 3,7-dimethyloctyl-dimethylsilyl group,lauryldimethylsilyl group, phenyl-C₁-C₁₂ alkylsilyl group, C₁-C₁₂alkoxyphenyl-C₁-C₁₂ alkylsilyl group, C₁-C₁₂ alkylphenyl-C₁-C₁₂alkylsilyl group, 1-naphtyl-C₁-C₁₂ alkylsilyl group, 2-naphtyl-C₁-C₁₂alkylsilyl group, phenyl-C₁-C₁₂ alkyldimethylsilyl group, triphenylsilylgroup, tri-p-xylylsilyl group, tribenzylsilyl group, diphenylmethylsilylgroup, t-butyldiphenylsilyl group, dimethylphenylsilyl group, etc.

The acyl group has usually about 2-20 carbon atoms, and specificexamples thereof include acetyl group, propionyl group, butyryl group,isobutyryl group, pivaloyl group, benzoyl group, trifluoroacetyl group,pentafluorobenzoyl group, etc.

The acyloxy group has usually about 2-20 carbon atoms, and specificexamples thereof include acetoxy group, propionyloxy group, butyryloxygroup, isobutyryloxy group, pivaloyloxy group, benzoyloxy group,trifluoroacetyloxy group, pentafluorobenzoyloxy group, etc.

The imino group has usually about 2-20 carbon atoms, and specificexamples thereof include groups represented by the following structure.

The amide group has usually about 2-20 carbon atoms, and specificexamples thereof include formamide group, acetamide group, propioamidegroup, butyroamide group, benzamide group, trifluoroacetamide group,pentafluorobenzamide group, diformamide group, diacetoamide group,dipropioamide group, dibutyroamide group, dibenzamide group,ditrifluoroacetamide group, dipentafluorobenzamide group, etc.

The imide group has usually about 2-60 carbon atoms, and specificexamples thereof include the following groups.

The substituted carboxyl group has usually about 2-60 carbon atoms, andmeans a carboxyl group substituted by alkyl group, aryl group, arylalkylgroup or monovalent heterocyclic group. Examples thereof includemethoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group,i-propoxycarbonyl group, butoxycarbonyl group, i-butoxycarbonyl group,t-butoxycarbonyl group, pentyloxycarbonyl group, hexyloxycarbonyl group,cyclohexyloxycarbonyl group, heptyloxycarbonyl group, octyloxycarbonylgroup, 2-ethylhexyloxycarbonyl group, nonyloxycarbonyl group,decyloxycarbonyl group, 3,7-dimethyloctyloxycarbonyl group,dodecyloxycarbonyl group, trifluoromethoxycarbonyl group,pentafluoroethoxycarbonyl group, perfluorobutoxycarbonyl group,perfluorohexyloxycarbonyl group, perfluorooctyloxycarbonyl group,phenoxycarbonyl group, naphtoxycarbonyl group, pyridyloxycarbonyl group,etc.

The monovalent heterocyclic group means an atomic group in which onehydrogen atom is removed from a heterocyclic compound, and usually hasabout 4-60 carbon atoms, and preferably 4-20 carbon atoms. Here, thecarbon atoms of the substituents are not counted as the carbon atoms ofthe heterocyclic group.

Here, the heterocyclic compound means an organic compound having acyclic structure in which at least one heteroatom such as oxygen,sulfur, nitrogen, phosphorus, boron, arsenic, etc. is contained in thecyclic structure as the element other than carbon atoms.

Specific examples include thienyl group, C₁-C₁₂ alkylthienyl group,pyroryl group, furyl group, pyridyl group, C₁-C₁₂ alkylpyridyl group,piperidyl group, quinolyl group, isoquinolyl group, etd., and thienylgroup, C₁-C₁₂ alkylthienyl group, pyridyl group, and C₁-C₁₂ alkylpyridylgroup are preferable.

Examples of the halogen atoms include fluorine atom, chlorine atom,bromine atom, and iodine atoms.

R and R′ in SiRR′ each independently represent, as above, hydrogen atom,halogen atom, hydroxyl group, alkyl group, alkoxy group, alkylthiogroup, aryl group, aryloxy group, arylthio group, arylalkyl group,arylalkoxy group, arylalkylthio group, substituted amino group, andmonovalent heterocyclic group. Specific examples thereof include thesame groups exemplified as the substituents which may be contained inaromatic ring such as A ring, B ring, etc.

In the above substituents, and the substituents in the examples of R andR′ of SiRR′ containing an alkyl chain therein, they may be any one oflinear, branched, cyclic, or the combination thereof. As the alkyl chainwhich is not linear, exemplified are isoamyl group, 2-ethylhexyl group,3,7-dimethyloctyl group, cyclohexyl group, 4-C₁-C₁₂ alkylcyclohexylgroup, etc. Ends of two alkyl chains may be connected to form a ring.

Furthermore, methyl or methylene as a part of said alkyl chain may bereplaced by a group containing a hetero atom, or a methyl or methylenegroup which is substituted with one or more fluorine atoms. As thehetero atom, an oxygen atom, a sulfur atom, a nitrogen atom, etc. areexemplified.

In view of solubility, liquid crystal property, electron- orhole-transporting property, etc., it is preferable that hetero atomcondensed ring unit has one or more of the above substituents.

Among the repeating units represented by the above formula (1-1), (1-2),(1-3), (1-4) or (1-5), (1-1) and (1-4) are preferable, and (1-4) is morepreferable. Examples of the preferable repeating unit are shown below.

In the formula, R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈, R₉, R₁₀, R₁₁ and R₁₂each independently represent alkyl group, alkoxy group, alkylthio group,aryl group, aryloxy group, arylthio group, arylalkyl group, arylalkoxygroup, arylalkylthio group, arylalkenyl group, arylalkynyl group, aminogroup, substituted amino group, silyl group, substituted silyl group,halogen atoms, acyl group, acyloxy group, imino group, amide group,imide group, monovalent heterocyclic group, carboxyl group, substitutedcarboxyl group, or cyano group. a and b each independently represent aninteger of 0-3. c represents 0 or 1. d represents an integer of 0-3. e,f, g and h each independently represent an integer of 0-5. i, j, k and leach independently represent an integer of 0-7. When each of a, b, d, e,f, g, h, i, j, k and l is two or more, the plurality of substituentsrepresented by R₁ to R₁₂ may be the same or different. And preferably,each of a+b, c+d, e+f, g+h, i+j, and k+l is two or more.

In the polymer containing hetero atom condensed ring unit used for thepresent invention, the amount of hetero atom condensed ring unit is 10mole % or more based on the whole repeating units, preferably 30 mole %or more, and more preferably 50 mole % or more.

In the polymer containing hetero atom condensed ring unit used for thepresent invention, said polymer can contain other repeating units thanthe hetero atom condensed ring unit, and among them, the below formula(3), formula (4), formula (5) and formula (6) are preferable.—Ar₁—  (3)

Ar₂—X₁

_(ff)Ar₃—  (4)—Ar₄—X₂—  (5)—X₃—  (6)

In the formula, Ar₁, Ar₂, Ar₃ and Ar₄ each independently represent anarylene group, divalent heterocyclic group or divalent group havingmetal complex structure. X₁, X₂ and X₃ each independently represent—CR₁₃═CR₁₄—, —C═C—, —N(R₁₅)—, or —(SiR₁₆R₁₇)_(m)—. R₁₃ and R₁₄ eachindependently represent hydrogen atom, alkyl group, aryl group,monovalent heterocyclic group, carboxyl group, substituted carboxylgroup, or cyano group. R₁₅, R₁₆ and R₁₇ each independently representhydrogen atom, alkyl group, aryl group, monovalent heterocyclic group,arylalkyl group or substituted amino group. ff represents an integer of1-2. m represents an integer of 1-12.

In the present invention, the arylene group means an atomic group inwhich two hydrogens are removed from an aromatic hydrocarbon, andusually has about 6-60 carbon atoms, preferably 6-20 carbon atoms. Here,the aromatic hydrocarbon includes those containing a condensed ring, andthose containing two or more independent benzene rings or condensedrings bonded directly or through a group such as a vinylene group or thelike.

Examples of the arylene group include phenylene group, biphenylenegroup, fluorene-diyl group, triphenylene group, stilbene-diyl,distilbene-diyl, and divalent condensed ring compound such asnaphthalenediyl group, anthracenylene group, phenanthrenediyl group,pyrenediyl group, etc. Among them, phenylene group, biphenylene group,fluorene-diyl group, and stilbene-diyl group are preferable.

In the present invention, the divalent heterocyclic group is an atomicgroup in which two hydrogen atoms are removed from a heterocycliccompound, and usually has about 3-60 carbon atoms. Here, theheterocyclic compound means an organic compound having a cyclicstructure in which at least one heteroatom such as oxygen, sulfur,nitrogen, phosphorus, boron, arsenic, etc. is contained in the cyclicstructure as the element other than carbon atoms.

As the divalent heterocyclic compound group, followings are exemplified.

Divalent heterocyclic group containing nitrogen as a hetero atom;pyridine-diyl group, diaza phenylene group, quinoline-diyl group,quinoxaline-diyl group, acridine-diyl group, bipyridyl-diyl group,phenanthroline-diyl group;

Groups having fluorene structure and containing silicon, nitrogen,sulfur, selenium, etc. as a hetero atom;

-   -   5 membered-ring heterocyclic groups containing silicon,        nitrogen, sulfur, selenium, etc. as a hetero atom;    -   Condensed 5 membered-ring heterocyclic groups containing        silicon, nitrogen, selenium, etc. as a hetero atom;    -   Groups in which 5 membered-ring heterocyclic group containing        silicon, nitrogen, sulfur, selenium, etc. as a hetero atom is        connected with a phenyl group at the a position of the hetero        atom to form a dimer or oligomer;    -   Groups in which 5 membered-ring heterocyclic group containing        silicon, nitrogen, sulfur, selenium, etc. as a hetero atom is        connected with a phenyl group at the a position of the hetero        atom;    -   Groups in which 5 membered-ring heterocyclic group containing        oxygen, nitrogen, sulfur, etc. as a hetero atom is connected        with a furyl group, or thienyl group.

In the present invention, the divalent group having metal complexstructure is a divalent group in which two hydrogen atoms are removedfrom an organic ligand of the metal having organic ligand. The organicligand usually has about 4-60 carbon atoms, and examples thereofinclude: 8-quinolinol and derivatives thereof, benzoquinolinol andderivatives thereof, 2-phenyl-pyridine and derivatives thereof,2-phenyl-benzothiazole and derivatives thereof, 2-phenyl-benzoxazole andderivatives thereof, porphyrin and derivatives thereof, etc.

Examples of the central metal of the complex include aluminum, zinc,beryllium, iridium, platinum, gold, europium, terbium, etc. Examples ofthe metal complex having organic ligand include low molecular weightfluorescent materials, known metal complex as phosphorescent materials,triplet light-emitting complexes, etc.

The polymer used for the polymer film of the present invention maycontain other repeating unit other than hetero atom condensed ring unitand repeating units represented by formulae (3)-(6) in an amount of notdeteriorating the electron- and hole-transporting properties.

These repeating units and other repeating units may be bonded throughnon-conjugated unit, and in the repeating units, the non-conjugated unitpart may be contained.

Examples of the connecting structure include the followings, and thecombination of two or more thereof, etc. Here, R shows the same groupwith R₁ to R₁₂, and Ar represents an aromatic hydrocarbon group having6-60 carbon atoms.

The polymer used for the polymer film of the present invention may alsobe a random, block or graft copolymer, or a polymer having anintermediate structure thereof, for example, a random copolymer havingblock property. From the viewpoint for obtaining a polymeric fluorescentsubstance having high fluorescent quantum yield, random copolymershaving block property and block or graft copolymers are more preferablethan complete random copolymers. Further, the polymer may have abranched main chain and more than three terminals. Moreover, the polymercompound may be a dendrimer.

Furthermore, the end group of polymer used for the polymer film of thepresent invention may also be protected with a stable group since if apolymerization active group remains intact, there is a possibility ofreduction in light emitting property and life-time when made into adevice. Those having a conjugated bond continuing to a conjugatedstructure of the main chain are preferable, and there are exemplifiedstructures connected to an aryl group or heterocyclic compound group viaa carbon-carbon bond (JP 9-45478A).

The polymer film of the present invention may be that containing one ofthe above-mentioned polymers or that containing two or more of theabove-mentioned polymers. For enhancing an electron or hole transportingproperty of the polymer film, a lower molecular weight compound orpolymer compound having an electron or hole transporting property canalso be mixed in addition to the above-mentioned polymers. As the holetransporting material, known materials can be used, and examples thereofinclude pyrazoline derivatives, arylamine derivatives, stilbenederivatives, triphenyldiamine derivatives, polyvinylcarbazole or itsderivatives, polysilane or its derivatives, polysiloxane derivativeshaving an aromatic amine at a side chain or main chain, polyaniline orits derivatives, polythiophene or its derivatives, polypyrrole or itsderivatives, polyphenylenevinylene or its derivatives,polythienylenevinylene or its derivatives, and the like, and as theelectron transporting material, known materials can be used, andexamples thereof include oxadiazole derivatives, anthraquinodimethane orits derivatives, benzoquinone or its derivatives, naphthoquinone or itsderivatives, anthraquinone or its derivatives,tetracyanoanthraquinodimethane or its derivatives, fluorenonederivatives, diphenyldicyanoethylene or its derivatives, diphenoquinonederivatives, or metal complexes of 8-hydroxyquinoline or itsderivatives, polyquinoline or its derivatives, polyquinoxaline or itsderivatives, polyfluorene or its derivatives, and the like.

Further, the polymer film of the present invention may contain a chargegenerating material for generating charge by light absorbed in thepolymer film. As the charge generating material, known materials can beused, and examples thereof include azo compounds and its derivatives,diazo compounds and its derivatives, non-metal phthalocyanine compoundand its derivatives, metal phthalocyanine compounds and derivativesthereof, perylene compounds and derivatives thereof, polycyclicquinone-based compounds and derivatives thereof, squalirium compoundsand derivatives thereof, azulenium compounds and derivatives thereof,thiapyrylium compounds and derivatives thereof, fullerenes such as C60and the like and derivatives thereof.

Furthermore, the polymer film may contain a material necessary formanifesting various functions. Examples thereof include materialsshowing a second order or third order non-linear optical effect forobtaining a photorefractive effect, sensitizers for sensitizing afunction for generating charge by light absorbed, stabilizers forincreasing stability, UV absorbers for absorbing UV light, and the like.

The polymer film of the present invention may contain as a polymerbinder a polymer material other than the above-mentioned polymers forenhancing a mechanical property. As the polymer binder, those notextremely disturbing an electron or hole transporting property arepreferable, and those showing not strong absorption for visible lightare preferably used. Examples of the polymer binder includepoly(N-vinylcarbazole), polyaniline or its derivatives, polythiophene orits derivatives, poly(p-phenylenevinylene) or its derivatives,poly(2,5-thienylenevinylene) or its derivatives, polycarbonate,polyacrylate, polymethyl acrylate, polymethyl methacrylate, polystyrene,polyvinyl chloride, polysiloxane and the like.

The thickness of the polymer film of the present invention is in therange of 1 nm to 100 μm, preferably in the range of 2 nm to 500 nm,further preferably in the range of 5 nm to 200 nm.

The method of producing a polymer film of the present invention is notparticularly restricted, and for example, a method of forming a filmfrom a solution containing the above-mentioned polymer, an electron orhole transporting material to be mixed if necessary, and polymer binderis exemplified.

A solvent used for film formation from a solution is not particularlyrestricted providing it can dissolve the above-mentioned polymer andelectron or hole transporting material to be mixed, and polymer binder.

As a good solvent for a polymer used for the polymer film of the presentinvention, exemplified are chlorine-based solvents such as chloroform,methylene chloride, dichloroethane and the like, ether-based solventssuch as tetrahydrofuran and the like, aromatic hydrocarbon-basedsolvents such as toluene, xylene, mesitylene, tetralin, decalin,n-butylbenzene and the like. A polymer compound is usually dissolved inan amount of 0.1 wt % or more in these solvents though the amountdepends on the structure and molecular weight of a polymer compound.

As the film formation method from a solution, application methods suchas a spin coat method, casting method, micro gravure coat method,gravure coat method, bar coat method, roll coat method, wire bar coatmethod, dip coat method, spray coat method, screen printing method,flexo printing method, offset printing method, inkjet printing methodand the like, and preferable are a spin coat method, flexo printingmethod and inkjet printing method.

The process for producing a polymer film of the present invention maycontain a process of orienting a polymer.

In a polymer film containing a polymer oriented by this process, mainchain molecules or side chain molecules are arranged along onedirection, there is a tendency of improvement in the electron or holemobility.

As the method of orienting a polymer, there can be used those known as aliquid crystal orienting method, for example, methods described in“Basic and application of liquid crystal (ekisho no kiso to oyo)”(Shoichi Matsumoto, Ichiyoshi Kakuta, joint, Kogyo Chosakai, 1991)chapter 5, “Structure and physical property of ferroelectric liquidcrystal (kyoyudensei ekisho nokozo tobussei)” (Atsuo Fukuda, HideoTakezoe, joint, Corona, 1990) chapter 7, “Liquid crystal (ekisho)”, vol.3, no. 1, (1999) pp. 3 to 16, and the like. Of them, a rubbing method,light orientation method, shearing method (dislocation stress applyingmethod) and lifting application method are simple, useful and easilyutilized as an orientation method and, preferable are a rubbing methodand shearing method. The rubbing method is a method of softly rubbingthe surface of a substrate with cloth and the like. As the substrate,there can be used glass, polymer films and the like. As the cloth forrubbing a substrate, cloth such as gauze, polyester, cotton, nylon,rayon and the like can be used. When an orientation film is separatelyformed on a substrate, an orientation ability increases further. As theorientation film, there are listed polyimide, polyamide, polyvinylalcohol, polyester, nylon and the like, and commercially availableorientation films for liquid crystal can be used. The orientation filmcan be formed by a spin coat method, flexo printing method and the like.The cloth used for rubbing can be appropriately selected correspondingto the orientation film used. The light orientation method is a methodof forming an orientation film on a substrate and irradiating the filmwith polarization UV light or UV light from inclined direction, to givean orientation function. As the orientation film, there are listedpolyimide, polyamide, polyvinyl cinnamate and the like, and commerciallyavailable orientation films for liquid crystal can also be used. In therubbing method or light orientation method, orientation can be made bysandwiching a polymer material oriented between substrate subjected tothe above-mentioned treatment. In this case, it is necessary to set asubstrate at a temperature under which a material shows a liquid crystalphase or isotropic phase. Temperature setting may be conducted beforesandwiching a polymer material between substrates or after sandwiching.The polymer material may only be applied on a substrate subjected to anorientation treatment. Application of a polymer can be conducted by amethod in which a polymer is placed on a substrate and set at atemperature of Tg or more or a temperature under which a liquid crystalphase or isotropic phase is shown, and coated along one direction by arod and the like, or a solution dissolved in an organic solvent isprepared, and the solution is applied by a spin coat method, flexoprinting method and the like. The shearing method is a method in whichon a polymer material placed on a substrate, another substrate isplaced, and the upper substrate is dislocated toward one direction at atemperature under which a liquid crystal phase or isotropic phase isshown. In this case, if a substrate subjected to the orientationtreatment as described in the above-mentioned rubbing method or lightorientation method is used, that having higher degree of orientation canbe obtained. As the substrate, glass and polymer films and the like canbe used, and that which is dislocated by stress may not be a substratebut be a metal rod or the like. The lifting application method is amethod in which a substrate is immersed in a polymer solution andlifted. The organic solvent used in a polymer solution and the speed oflifting a substrate are not particularly restricted, and can be selectedand controlled, corresponding to the degree of orientation of a polymer.The polymer orientation process is sometimes conducted after a processof making a film from a polymer like the rubbing method and shearingmethod, and sometimes conducted simultaneously with a process of makinga film from a polymer like the lifting application. A process of makingan orientation film may be contained before a process of making a filmfrom a polymer.

The polymer film of the present invention has an electron or holetransporting property, therefore, it can be used for various polymerfilm devices such as an organic transistor, organic solar battery,optical sensor, electrophotographic photoreceptor, spatial lightmodulator, photorefractive device and the like, by controllingtransportation of electrons or holes injected from an electrode, orcharges generated by light absorption. When the polymer film is used inthese polymer film devices, it is preferable to orient the polymer filmby an orientation treatment since then an electron or hole transportingproperty is improved.

FIGS. 1 and 2 are drawings illustrating application of the polymer filmof the present invention to an organic transistor, as a typical example.Adjacent to a polymer film (2), a source electrode (5) and drainelectrode (6) are formed, further, a gate electrode (4) is placedbetween both the electrodes via an insulator film (3). The electrodematerial may be a material having high conductivity, and metals such asaluminum, gold, silver, copper and the like can be used. The insulatorfilm may be a material showing high electric insulation property, andfor example, SiO_(x), SiN_(x), polyimides and the like can be used. Asthe substrate material (1), silicon substrates, glass substrates,plastic substrates and the like can be used.

FIG. 3 is a view illustrating application of the polymer film of thepresent invention to a solar battery, as a typical example. A polymerfilm (2) is placed between a pair of electrodes (7) one of which istransparent or semi-transparent. As the electrode material, metals suchas aluminum, gold, silver, copper, alkali metals, alkaline earth metalsand the like, or semi-transparent films, transparent conductive filmsmade of them, can be used. For obtaining high open-circuit voltage, itis preferable to select electrodes so that a difference in work functionis large. In the polymer film, a carrier generation agent, sensitizerand the like can be added to enhance photosensitivity. As the substratematerial (1), silicon substrates, glass substrates, plastic substratesand the like can be used.

FIGS. 4 to 6 are views illustrating application of the polymer film ofthe present invention to an optical sensor, as a typical example. Apolymer film (2) is placed between a pair of electrodes (7) one of whichis transparent or semi-transparent. A charge generating layer (8)absorbing light to generate charge can also be inserted. As theelectrode material, metals such as aluminum, gold, silver, copper,alkali metals, alkaline earth metals and the like, or semi-transparentfilms, transparent conductive films made of them, can be used. Forenhancing photosensitivity, a carrier generation agent, sensitizer andthe like can be added into a polymer film. As the substrate material(1), silicon substrates, glass substrates, plastic substrates and thelike can be used.

FIGS. 7 to 9 are views illustrating application of the polymer film ofthe present invention to an electrophotographic photoreceptor, as atypical example. A polymer film (2) is placed on an electrode (7). Acharge generating layer (8) absorbing light to generate charge can alsobe inserted. As the electrode material, metals such as aluminum, gold,silver, copper and the like can be used. For enhancing photosensitivity,a carrier generation agent, sensitizer and the like can be added into apolymer film. As the substrate material, silicon substrates, glasssubstrates, plastic substrates and the like can be used. A metal such asaluminum and the like can also be used as a substrate material and as anelectrode simultaneously.

FIG. 10 is a view illustrating application of the polymer film of thepresent invention to a spatial light modulator, as a typical example. Apolymer film (2), dielectric mirror layer (10) and liquid crystal layer(9) are placed between a pair of transparent or semi-transparentelectrodes (7). The dielectric mirror layer is preferably composed of amulti-layer film made of a dielectric substance, and is so designed thatit has a wavelength region of low reflectance and a wavelength region ofhigh reflectance, and its boundary rises steeply. For the liquid crystallayer, various liquid crystal materials can be used, and it ispreferable to use ferroelectric liquid crystals. As the electrodematerial, semi-transparent films, transparent conductive films madealuminum, gold, silver, copper and the like having high conductivity canbe used. As the substrate material, transparent or semi-transparentmaterials such as glass substrates, plastic substrate and the like canbe used.

FIG. 11 is a view illustrating application of the polymer film of thepresent invention to a photorefractive device, as a typical example. Apolymer film (2) is placed between a pair of transparent orsemi-transparent electrodes (7). In the polymer film, a second order orthird order non-linear optical material showing a non-linear opticaleffect can be mixed, and a carrier generating agent, sensitizer and thelike can be added to enhance photosensitivity. As the electrodematerial, semi-transparent films, transparent conductive films madealuminum, gold, silver, copper and the like having high conductivity canbe used. As the substrate material, transparent or semi-transparentmaterials such as glass substrates, plastic substrate and the like canbe used.

The following examples will illustrate the present invention further indetail, but the scope of the invention is not limited to them.

Here, the number-average molecular weight in terms of polystyrene wasmeasured by gel permeation chromatography (GPC) using chloroform as asolvent.

REFERENCE EXAMPLE 1

Into 1 L four-necked flask, under an inert atmosphere, was charged 7 gof 2,8-dibromodibenzothiophene and 280 ml of THF, and they were stirredat room temperature to be dissolved, then, cooled down to −78° C. 29 mlof n-butyllithium (1.6 mol hexane solution) was dropped on this. Aftercompletion of dropping, the solution was stirred for 2 hours whilemaintaining the temperature, and 13 g of trimethoxyboronic acid wasdropped. After completion of dropping, the mixture was returned slowlyto room temperature. The mixture was stirred at room temperature for 3hours, and disappearance of raw material was confirmed by TLC. 100 ml of5% sulfuric acid was added to complete the reaction, and the mixture wasstirred at room temperature for 12 hours. The resulted solution waswashed with water added, and the organic layer was extracted. Thesolvent was substituted by ethyl acetate, then, 5 ml of 30% hydrogenperoxide water was added, and the mixture was stirred at 40° C. for 5hours. Thereafter, the organic layer was extracted, and the residue waswashed with a 10% ammonium iron(II) sulfate aqueous solution and dried,then, the solvent was removed, to obtain 4.43 g of brown solid. This isreferred to as compound A.

Into a 200 ml three-necked flask, under an inert atmosphere, was charged4.43 g of compound A, 25.1 g of n-octyl bromide and 12.5 g (23.5 mmol)of potassium carbonate, and 50 ml of methyl isobutyl ketone as a solventwas added, and the mixture was refluxed under heat at 125° C. for 6hours. After completion of the reaction, the solvent was removed, andthe residue was separated between chloroform and water, and the organiclayer was extracted, further, the residue was washed with water twice.After drying over anhydrous sodium sulfate, purification was performedby a silica gel column (developing solvent: toluene/cyclohexane=1/10),to obtain 8.49 g of compound B.

Into a 100 ml three-necked flask was charged 6.67 g of compound B and 40ml of acetic acid, and the mixture was heated up to a bath temperatureof 140° C. in an oil bath. Subsequently, 13 ml of 30% hydrogen peroxidewater was added from a cooling tube and the mixture was stirredvigorously for 1 hour, then, 180 ml of cold water was poured to completethe reaction. The reaction solution was extracted with chloroform anddried, then, the solvent was removed to obtain 6.96 g of compound C.

Into a 200 ml four-necked flask, under an inert atmosphere, was charged3.96 g of compound C and 15 ml of a acetic acid/chloroform mixture(=1:1), and the mixture was stirred at 70° C. for dissolution thereof.Subsequently, 6.02 g of bromine was dissolved in 3 ml of theabove-mentioned solvent and added, and the mixture was stirred for 3hours. A sodium thiosulfate aqueous solution was added to this to removeunreacted bromine, and the remaining solution was partitioned betweenchloroform and water, and the organic layer was extracted and dried. Thesolvent was removed, and the residue was purified on silica gel column(developing solvent: chloroform/hexane=1/4) to obtain 4.46 g of compoundD.

Into a 200 ml three-necked flask, under an inert atmosphere, was charged3.9 g of compound D and 50 ml of diethyl ether, and the mixture washeated up to 40° C. and stirred. 1.17 g of lithium aluminum hydride wasadded portion-wise, and reacted for 5 hours. By adding waterportion-wise, excess lithium aluminum hydride was decomposed, and washedwith 5.7 ml of 36% hydrochloric acid. The solution was partitionedbetween chloroform and water, and the organic layer was extracted, then,dried. The dried substance was purified on silica gel column (developingsolvent: chloroform/hexane=1/5) to obtain 1.8 g of compound E.

Compound F was synthesized containing an i-pentyloxy group instead of ann-octyloxy group in compound E. 13.8 g of compound F was obtained usingthe same synthesis method as for compound E except that i-pentyl bromidewas used instead of n-octyl bromide in the synthesis of compound B.

299 mg of compound E, 259 mg of compound F and 312 mg of 2,2′-bipyridylwas dissolved in 20 ml of dehydrated tetrahydrofuran, then, the systemwas purged with nitrogen by babbling of nitrogen. Under a nitrogenatmosphere, 550 mg of bis(1,5-cyclooctadiene) nickel (O) {Ni(COD)₂} wasadded to this solution, and the mixture was heated up to 60° C. andreacted for 3 hours. After the reaction, this reaction solution wascooled to room temperature (about 25° C.), and dropped in a mixedsolution of 10 ml of 25% ammonia water/120 ml of methanol/50 ml of ionexchanged water and the mixture was stirred for 1 hours, then, thedeposited precipitate was filtrated and dried under reduced pressure for2 hours, and dissolved in 30 ml of toluene. Thereafter, 30 ml of 1 Nhydrochloric acid was added and the mixture was stirred for 1 hour, theaqueous layer was removed and 30 ml of 4% ammonia water was added to theorganic layer, and the resulted mixture was stirred for 1 hour, hen, theaqueous layer was removed. The organic layer was dropped in 200 ml ofmethanol and the resulted mixture was stirred for 1 hour, the depositedprecipitate was filtrated and dried under reduced pressure for 2 hours,and dissolved in 30 ml of toluene. Thereafter, the solution was purifiedthrough an aluminum column (alumina amount: 5 g), and the recoveredtoluene solution was dropped in 250 ml of methanol, the mixture wasstirred for 1 hour, and the deposited precipitate was filtrated anddried under reduced pressure for 2 hours. The yield of the resultedpolymer was 155 mg. This polymer is referred to as polymer 1.

The average molecular weight in terms of polystyrene of polymer 1 wasMn=9.0×10⁴ and Mw=2.0×10⁵.

Polymer 1 was sandwiched between two glass substrates subjected to anorientation treatment, then, set in a temperature control apparatus.This was heated from room temperature while observing by a polarizationmicroscope, consequently, a liquid crystal phase was shown around 190%.When the sample was rotated under cross nicol, the observed image showedlight and dark change, confirming orientation of the liquid crystal. Theorientation treatment of the substrate was conducted by applying anorientation film SE5291 manufactured by Nissan Chemical Industries, Ltd.on a washed glass substrate by spin coating, and baking this, then,rubbing this by rayon along one direction.

REFERENCE EXAMPLE 2

Under an inert atmosphere, 90 g of 3-bromophenol was dissolved in 600 mlof ethanol. Further, 39 g potassium hydroxide was added to this and themixture was heated up to 70° C. for dissolution thereof. From a droppingfunnel, 126 g of 3,7-dimethylbromooctane was dropped over 15 minutes.After completion of dropping, the mixture was heated to 84° C. andstirred for about 22 hours under heat. After completion of heating, themixture was left to cool to room temperature. The reaction solution wasbisected, 500 ml of water was added to respective portions, then,ethanol was distilled off by an evaporator. The solutions afterdistilling off of ethanol were combined and trisected, 300 ml of ethylacetate was added to respective portions to cause liquid separation, andthe organic layers were washed with 200 ml of water twice. The organiclayers were combined and the solvent was distilled off by an evaporator,then, the residue was dried by heating at 90° C. for 5 hours undervacuum by a rotary pump. About 150 g of3-(3,7-dimethyloctyloxy)-bromobenzene was obtained as an oily product.

Under an inert atmosphere, 7.5 g of magnesium and a small amount ofiodine were charged in 100 ml of dried tetrahydrofuran in a three-neckedflask. Using a dropping funnel, 90 g of the above-mentioned3-(3,7-dimethyloctyloxy)-bromobenzene was dropped over 50 minutes. Aftercompletion of dropping, 200 ml of dried tetrahydrofuran was added, andthe mixture was stirred while heating for 2 hours under reflux toprepare a Grignard reagent. After completion of heating, the reagent wasleft to cool to room temperature. Into a three-necked flask other thanthe above-mentioned flask was charged 38 g of trimethylboric acid and300 ml of dried tetrahydrofuran, and the flask was cooled in a dryice/aceton bath. Using a dropping funnel, the above-mentioned Grignardreagent solution was dropped over 35 minutes. After completion ofdropping, the reaction solution was heated up to room temperature. Thereaction solution was added to dilute sulfuric acid (sulfuric acid 12ml/water 360 ml) and the mixture was stirred, then, bisected and theportions were extracted with 150 ml of ethyl acetate and 100 ml ethylacetate, respectively. The organic layers were combined, then, trisectedand respective portions were washed with 100 ml of water. The washedorganic layers were combined and the solvent was distilled off by anevaporator, then, 100 ml of hexane was added to suspend a solidcomponent and the suspension was filtrated. Further, the filtratedsubstance was washed with 100 ml of hexane. 63 g of3-(3,7-dimethyloctyloxy)-phenylboric acid was obtained in the form ofwhile solid. Under an inert atmosphere, into a three-necked flask wascharged 60 g of the above-mentioned3-(3,7-dimethyloctyloxy)-bromobenzene, 250 ml of toluene, 250 ml ofwater, 62 g of potassium carbonate and 1.2 g oftetrakis(triphenylphosphine)palladium complex. Argon was bubbled throughthe solution for 20 minutes to remove oxygen, then, 63 g of theabove-mentioned 3-(3,7-dimethyloctyloxy)-phenylboric acid was added andthe mixture was heated up to 90° C., and stirred for 8 hours whileheating at the same temperature. After completion of heating, themixture was left to cool to room temperature. The toluene layer wasseparated, then, a colored component was removed by silica gel columnchromatography. The solvent was distilled off to obtain 98 g of an oilyproduct. This is referred to as compound G.

20 g of the above-mentioned compound G was dissolved in 400 ml of driedN,N-dimethylformamide. Under ice cool, a solution was N-bromosuccinimide15.5 g/N,N-dimethylformamide 300 ml was dropped. This was dropped over90 minutes. After completion of dropping, the ice bath was removed andthe mixture was stirred over night. The solvent was distilled off, then,the residue was dissolved in 200 ml of toluene, the resulted solutionwas washed with 200 ml of water three times, then, the solvent wasdistilled off to obtain 26 g of an oily product. This is referred to ascompound H.

A 200 ml four-necked flask was purged with argon, 5.00 g (8.0 mmol) ofcompound H was dissolved in 80 ml of dehydrated ether, and the solutionwas cooled to −78%. To this solution, 11 ml of n-butyllithium (17.6mmol, 1.6 M hexane solution) was dropped, and the mixture was stirredfor 3.5 hours. This solution was dropped in 500 ml of an ether solutionof 25.8 g (152 mmol) of silicon tetrachloride cooled to −78° C. Afterstirring for 1 hour, the mixture was heated up to room temperature, andstirred for 15 hours. The reaction solution was filtrated under argon,and the filtrate was concentrated to obtain 4.52 g of crude product.

The crude product obtained above was placed in an argon-purged 500 mlthree-necked flask and dissolved in 90 ml of dehydrated ether, and thesolution was cooled to −78%. To this solution, 23 ml of phenyllithium(24 mmol, 1.06 M cyclopentane/ether solution) was dropped. Afterstirring for 20 minutes, the mixture was heated up to room temperatureand stirred for 4 hours. Water was added to this to cause liquidseparation, and the aqueous layer was extracted with diethyl ether. Theorganic layers were combined and washed with a saturated sodium hydrogencarbonate aqueous solution and saturated saline. The mixture was driedover sodium hydrogen sulfate, and the solvent was distilled off, toobtain 6.66 g of a crude product. This is referred to as compound I.

In an argon-purged 300 ml three-necked flask, 5.00 g of compound I(purity 85.1%, 6.6 mmol) was placed and dissolved in 65 ml of dehydratedDMF. Into this solution was charged 2.45 g (13.8 mmol) ofN-bromosuccinimide. The mixture was stirred at room temperature for 5hours, then, extracted with 80 ml×5 of hexane in a globe box. Thesolvent was distilled off to obtain 14.02 g of a crude product (LC19.9%, containing DMF). After separating by reverse phase silica gelcolumn chromatography (acetonitrile:toluene=20:1), the fraction wasextracted with hexane (for removing a trace amount of acetic acid inacetonitrile), and washed with a 5% sodium hydrogen carbonate aqueoussolution and saturated saline, and dried over sodium sulfate, then, thesolvent was distilled off to obtain 0.30 g of compound J.

504 mg of compound J and 320 mg of 2,2′-bipyridyl were charged in areaction vessel, then, the reaction system was purged with an argon gas.To this was added 20 ml of tetrahydrofuran (dehydrated solvent)deaerated by bubbling with an argon gas previously. Next, to this mixedsolution was added 600 mg of bis(1,5-cyclooctadiene) nickel (0), themixture was stirred at room temperature for 10 minutes, then, reactedfor 3 hours at 60° C. The reaction was conducted in a nitrogen gasatmosphere.

After the reaction, this reaction solution was cooled to roomtemperature (about 25° C.), and dropped in a mixed solution of 25%ammonia water 10 ml/methanol 120 ml/ion exchanged water 50 ml, and themixture was stirred for 1 hour, then, the deposited precipitate wasfiltrated and dried under reduced pressure for 2 hours. And dissolved in30 ml of toluene. Thereafter, 30 ml of 1 N hydrochloric acid was addedand the mixture was stirred for 1 hour, the aqueous layer was removed,and 30 ml of 4% ammonia water was added, the mixture was stirred for 1hour, then, the aqueous layer was removed. The organic layer was droopedin 200 ml of methanol and the mixture was stirred for 1 hour, thedeposited precipitate was filtrated and dried under reduced pressure for2 hours, and dissolved in 30 ml of toluene. Thereafter, the solution waspurified through an aluminum column (alumina amount 5 g), and therecovered toluene solution was dropped in 250 ml of methanol and themixture was stirred for 1 hour, and the deposited precipitate wasfiltrated and dried under reduced pressure for 2 hours. The yield of theresulted polymer was 90 mg. This polymer is referred to as polymer 2.This polymer 2 had a polystyrene-reduced number-average molecular weightof 4.4×10⁴, and a polystyrene-reduced weight-average molecular weight of1.0×10⁵.

Polymer 2 was observed by a polarization microscope by the same manneras for polymer 1, as a result, polymer 2 manifested transition to aliquid crystal phase around 120° C., showing an orientation property.

<Fabrication of Device for Measuring Time of Flight and Measurement ofHole Mobility>

0.015 g of polymer 2 was weighed and toluene was added to this up to 1g, preparing a toluene solution of polymer 2.

The above obtained toluene solution of polymer 2 was cast to form a filmhaving a thickness of 4.1 μm on a transparent conductive film (ITO)formed on glass. Further, an Al electrode was vapor-deposited by avacuum vapor deposition method on the film of polymer 2, to obtain asample for measuring time of flight. On this sample, positive voltagewas applied on the transparent electrode against the Al electrode, andflash light (wavelength: 337 nm, flash time: 1 nsec) was introduced fromthe transparent electrode side using a nitrogen laser, and thetransition photocurrent of hole was measured. The hole mobility wascalculated from an inflection point on log-log plot of time-transitionphotocurrent. As a result, a hole mobility of 6×10⁻⁴ cm²/V/s wasobtained at a measuring temperature of 27° C. and an applied voltage of200 V (electric field strength: up to 0.5 MV/cm).

EXAMPLE 1

<Fabrication of Polymer Film Device and Measurement of Solar BatteryProperty>

A suspension of poly (3,4) ethylene dioxythiophene/polystyrenesulfonicacid (manufactured by Bayer, Baytron P AI 4083) was filtrated through a0.2 μm membrane filter, then, spin-coated to form a film having athickness of 70 nm on a glass substrate carrying an ITO film having athickness of 150 nm provided by a sputtering method, and dried on a hotplate at 200° C. for 10 minutes. Then, a polymer film having a thicknessof 70 nm was formed by spin coating at room temperature using a 1.5 wt %toluene solution of polymer 1. Further, this was dried at 60° C. for 1hour under reduced pressure, then, about 0.2 nm of lithium fluoride,then, 5 nm of calcium, further, 180 nm of aluminum were vapor-depositedas an electrode, to produce polymer film device using polymer 1. Thedegrees of vacuum in vapor deposition were all 11×10⁻⁴ Pa or less. Whileirradiating the resulted film device with xenon lamp, a voltage-currentproperty was measured. As a result, solar battery properties of ashort-circuit current of 30 μA/cm² and an open-circuit voltage of 1.8 Vwere obtained.

EXAMPLE 2

<Fabrication of Polymer Film Device and Measurement of Solar BatteryProperty>

A polymer film device was produced in the same manner as in Example 1using polymer 2 instead of polymer 1. While irradiating the resultedfilm device with xenon lamp, a voltage-current property was measured. Asa result, a short-circuit current of 25 μA/cm² and an open-circuitvoltage of 1.1 V were obtained.

EXAMPLE 3

<Measurement of Optical Sensor Property>

Using the polymer film device using polymer 1 produced in Example 1,properties as an optical sensor were evaluation. While irradiating withxenon lamp, a voltage-current property was measured. As a result, aphoto-current of 97 mA/cm² flowed at an applied voltage of 3.6 V. Whenmeasured without irradiating with xenon lamp, a dark-current of 26mA/cm² flowed at an applied voltage of 3.6 V.

INDUSTRIAL APPLICABILITY

The present invention relates to a polymer film containing a polymerhaving liquid crystallinity and having an electron mobility or holemobility of 10⁻⁵ cm²/Vs or more. This polymer film is useful as a filmfor various polymer film devices such as an organic transistor, organicsolar battery, optical sensor, electrophotographic photoreceptor,spatial light modulator, photorefractive device and the like.

1. A polymer film comprising a polymer having liquid crystallinity,having a number-average molecular weight in terms of polystyrene of 10³to 10⁸ and having an electron mobility or hole mobility of 10⁻⁵ cm²/Vsor more, and having a film thickness in the range from 1 nm to 100 μm,wherein the polymer contains repeating units of the following formula(1-1), (1-2), (1-3), (1-4) or (1-5):

wherein X represents a hetero atom or a divalent group containing heteroatoms, and A ring, B ring, C ring, D ring, E ring, F ring and G ringeach represent independently an aromatic ring optionally having asubstituent selected from the group consisting of alkyl groups, alkoxygroups, alkylthio groups, aryl groups, aryloxy groups, arylthio groups,arylalkyl groups, arylalkoxy groups, arylalkylthio groups, arylalkenylgroups, arylalkynyl groups, amino groups, substituted amino groups,silyl group, substituted silyl groups, halogen atoms, acyl groups,acyloxy groups, imino groups, amide groups, imide groups, monovalentheterocyclic groups, carboxyl group, substituted carboxyl groups andcyano group.
 2. The polymer film according to claim 1 wherein Xrepresents S, O or SiRR′ (wherein, R and R′ each represent independentlya hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group, analkoxy group, an alkylthio group, an aryl group, an aryloxy group, anarylthio group, an arylalkyl group, an arylalkoxy group, anarylalkylthio group, a substituted amino group, or a monovalentheterocyclic group).